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題 名 | 一種Raptor Code的高效率編碼方法=An Efficient Encoding Method for Raptor Code |
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作 者 | 焦信達; 張仕穎; 陳宣同; 孫宏民; | 書刊名 | 電腦與通訊 |
卷 期 | 152 2013.08[民102.08] |
頁 次 | 頁14-22 |
專 輯 | 智慧視訊與影音匯流技術專題 |
分類號 | 312.1、312.1 |
關鍵詞 | 猛禽碼; 行動多媒體廣播; 應用層前向糾錯技術; Raptor code; Mobile multimedia broadcasting; Application layer- forward error correction; AL-FEC; |
語 文 | 中文(Chinese) |
中文摘要 | 猛禽碼(Raptorcode)可提供良好的錯誤更正能力及編解碼效率。它的噴泉碼(fountaincode)特性可有效地避免單播及群播服務的封包重傳工作。因此,有許多無線及有線寬頻的應用採用它,例如:行動多媒體廣播系統及寬頻IPTV系統。但對串流服務來說,為了提升保護區間(protectionperiod)長度,或是提升串流伺服器的支援頻道數,提高猛禽碼的編碼效率仍是必要的。在本論文中,我們提出了一種針對已知固定區塊長度的高效率系統化猛禽碼編碼方法,其運作以運算序列(operationlist)為基礎。對於會使用一到數個固定區塊長度的猛禽碼應用來說,我們可以預先產生相對應的運算序列,並使用它們來更有效率地產生編碼符號。我們首先介紹我們所提出的猛禽碼編碼器的基本架構,接著描述產生運算序列以及猛禽碼中間符號(intermediatesymbol)的細節。模擬結果顯示我們所提出的編碼器,至少比3GPP及DVB-H標準所建議的傳統猛禽碼編碼器的運算速度快兩倍。 |
英文摘要 | Raptor code can provide good error correction capability and efficient encoding and decoding performance. Its fountain code property is effective in avoiding packet retransmission for both unicast and multicast service delivery. Hence, there are many wireless and broadband applications adopting it such as mobile multimedia broadcasting and broadband IPTV systems. However, for streaming services, to increase the performance of Raptor code encoding is still necessary in order to support a longer protection period or to increase the number of channels supported by a streaming server. In this paper, we present an efficient systematic Raptor code encoder based on operation lists for known block lengths. For a Raptor code application that can frequently use one or several fixed block lengths (i.e., the number of source symbols in a source block), we could produce the corresponding operation lists in advance and use them to generate the encoding symbols more efficiently. We first introduce the basic architecture of the proposed Raptor encoder, and then describe the details about how to generate operation lists and Raptor intermediate symbols. The simulation results show that our encoder is at least two times faster than the conventional Raptor code encoder which is adopted by 3GPP and DVB-H. |
本系統中英文摘要資訊取自各篇刊載內容。